There is not. In AE and in pretty much every application that works with video and film files there isn't really a way to use English or Metric measurements.
That's because there is no standard display screen. You can watch a DVD on a portable DVD player, or you can project the same DVD on the side of a building. In each case, the image is the same: 720x480 pixels.
See why there's no such thing as millimeters in AE?
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA